What is required when using chutes for material drops?

When using chutes for material drops, the requirement to ensure that no materials shall be dropped outside the exterior walls unless they are properly protected is a critical safety measure. This regulation is in place to prevent injuries to workers and the public, as unprotected material falls can lead to serious accidents. Proper protection may include barriers or containment systems designed to safely manage debris and prevent it from falling into areas where people may be present.

This requirement emphasizes the importance of maintaining site safety protocols, particularly in construction areas where material handling and movement can pose hazards. By keeping the material drops within protected boundaries, construction sites can mitigate risks associated with falling materials, thereby safeguarding personnel and passersby.

The other options either suggest less stringent conditions or requirements that do not align with standard safety practices, which is why they are not suitable in this context.